Fix tests for DNF 3
    
    The configuration for modules has changed.
    
    Lookaside handling has changed, and there are now test failures. This
    is a not a bug in DNF, so we need to fix it on our side.
    
    Relates: https://bugzilla.redhat.com/show_bug.cgi?id=1603123
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>